<template>
  <div>
    <el-breadcrumb separator-class='el-icon-arrow-right'>
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert
        title='注意: 只允许为第三级分类设置相关参数!'
        type='warning' :closable='false' show-icon>
      </el-alert>

      <el-row class='cat_opt'>
        <span>选择商品分类: </span>
        <!-- 级联选择框 -->
        <el-cascader expandTrigger='hover' v-model='selectdCateKeys' :options='cataList' :props='cateProps'
                     @change='handleChange'></el-cascader>
      </el-row>

      <el-tabs v-model='activeName' @tab-click='handleClick'>
        <el-tab-pane label='动态参数' name='many'>
          <el-button type='primary' @click='addDialogVisible = true' size='mini' :disabled='isBtnDisabled'>添加参数
          </el-button>
          <el-table :data='manyTableData' border stripe>
            <el-table-column type='expand'>
              <template v-slot="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag closable v-for="(item, index) in scope.row.attr_vals" :key="index" @close="handleClosed(index, scope.row)"> {{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column label='序号' type='index'></el-table-column>
            <el-table-column label='参数名称' prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template v-slot='scope'>
                <el-button type='primary' icon='el-icon-edit' size='mini' @click='showEditDialog(scope.row.attr_id)'>
                  编辑
                </el-button>
                <el-button type='danger' icon='el-icon-delete' size='mini' @click='removeParams(scope.row.attr_id)'>删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <el-tab-pane label='静态属性' name='only'>
          <el-button type='primary' @click='addDialogVisible = true' size='mini' :disabled='isBtnDisabled'>添加属性
          </el-button>
          <el-table :data='onlyTableData' border stripe>
            <el-table-column type='expand'>
              <template v-slot="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag closable v-for="(item, index) in scope.row.attr_vals" :key="index" @close="handleClosed(index, scope.row)"> {{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column label='序号' type='index'></el-table-column>
            <el-table-column label='属性名称' prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template v-slot='scope'>
                <el-button type='primary' icon='el-icon-edit' size='mini' @click='showEditDialog(scope.row.attr_id)'>编辑</el-button>
                <el-button type='danger' icon='el-icon-delete' size='mini' @click='removeParams(scope.row.attr_id)'>删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>


    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync='addDialogVisible' width='50%' @close='addDialogClosed'>
      <el-form :model='addForm' ref='addFormRef' label-width='100px'>
        <el-form-item :label='titleText' prop='attr_name'>
          <el-input v-model='addForm.attr_name'></el-input>
        </el-form-item>
      </el-form>
      <span slot='footer' class='dialog-footer'>
        <el-button @click='addDialogVisible = false'>取 消</el-button>
        <el-button type='primary' @click='addParams'>确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync='editDialogVisible' width='50%' @close='editDialogClosed'>
      <el-form :model='editForm' ref='editFormRef' label-width='100px'>
        <el-form-item :label='titleText' prop='attr_name'>
          <el-input v-model='editForm.attr_name'></el-input>
        </el-form-item>
      </el-form>
      <span slot='footer' class='dialog-footer'>
        <el-button @click='editDialogVisible = false'>取 消</el-button>
        <el-button type='primary' @click='editParams'>确 定</el-button>
      </span>
    </el-dialog>
  </div>

</template>

<script>
export default {
  data() {
    return {
      cataList: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectdCateKeys: [],
      manyTableData: [],
      onlyTableData: [],
      activeName: 'many',
      addDialogVisible: false,
      addForm: {},
      editDialogVisible: false,
      editForm: {},
      inputVisible: false,
      inputValue: ''
    }
  },

  created() {
    this.getCateList()
  },

  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      this.cataList = res.data
      // console.log(this.cataList)
    },

    async handleChange() {
      // 证明选中的不是三级分类
      if (this.selectdCateKeys.length !== 3) {
        this.selectdCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // console.log(this.selectdCateKeys)
      // 根据所选的分类的ID,和当前所处的面板,获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败!')
      }
      // 获取Tag的数据分割为数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示和隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }

    },

    handleClick() {
      // console.log(this.activeName)
      this.handleChange()
    },
    addDialogClosed() {
      this.addDialogVisible = false
      this.$refs.addFormRef.resetFields()
    },
    async addParams() {
      const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
        attr_name: this.addForm.attr_name,
        attr_sel: this.activeName
      })
      if (res.meta.status !== 201) {
        return this.$message.error('添加分类失败!')
      }
      this.handleChange()
      this.addDialogVisible = false

    },

    editDialogClosed() {
      this.editDialogVisible = false
      this.$refs.editFormRef.resetFields()
    },

    async showEditDialog(id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
        params: { attr_sel: this.activeName }
      })
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },

    async editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败!')
        }
        // console.log(res)
        this.$message.success('修改参数成功!')
        this.handleChange()
        this.editDialogVisible = false
      })
    },

    async removeParams(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '删除', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除操作!')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败!')
      }
      this.$message.success('删除参数成功')
      this.handleChange()
    },

    // Tag标签的删除
    handleClosed(index, row) {
      row.attr_vals.splice(index, 1)
      console.log( row.attr_vals);
      this.saveAttrVals(row)
    },

    showInput(row){
      console.log(row)
      row.inputVisible = true
      // 自动获取焦点
      // $nextTick 方法作用: 当页面上的元素被重新渲染之后,才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },

    // 文本框失去焦点和回车触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }

      // 如果没有return证明内容合法做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发送请求,保存
      this.saveAttrVals(row)
    },

    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_sel: this.activeName,
        attr_name: row.attr_name,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败!')
      }
      this.$message.success('修改参数项成功!')
    },
  },

  computed: {
    isBtnDisabled() {
      if (this.selectdCateKeys.length == 3) {
        return false
      } else {
        return true
      }
    },
    cateId() {
      if (this.selectdCateKeys.length === 3) {
        return this.selectdCateKeys[2]
      }
      return null
    },
    titleText() {
      if (this.activeName == 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 5px 10px;
}

.button-new-tag {
  margin: 5px 10px;
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
}

.input-new-tag {
  width: 90px;
  margin: 5px 10px;
  vertical-align: bottom;
}
</style>
